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🧪 Chemistry  ·  States of Matter  ·  NEET & JEE

A gas at 300 K has a volume of 600 mL. What is its volume at 600 K at constant pressure?

Answer: 1200 mL.

  • A 300 mL
  • B 600 mL
  • C 1200 mL
  • D 1800 mL

Correct answer: C. 1200 mL

Explanation: By Charles Law, V<sub>1</sub>/T<sub>1</sub> = V<sub>2</sub>/T<sub>2</sub>: 600/300 = V<sub>2</sub>/600, so V<sub>2</sub> = 1200 mL.

Graph of pressure versus volume for a fixed amount of gas at constant temperature: the curve falls steeply then flattens, a hyperbola showing pressure inversely proportional to volume.

Boyle's law: at constant temperature the pressure of a fixed mass of gas is inversely proportional to its volume (P ∝ 1/V), so the P–V plot is a hyperbola — halving the volume doubles the pressure. Image: Reginaprice2013, CC BY-SA 3.0, via Wikimedia Commons.

Concept context

Discover why gases expand to fill any container while liquids flow and solids hold their shape. Master the gas laws, the ideal gas equation, and the reasons real gases deviate from ideal behavior.

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